A Phased Array of Widely Separated Antennas for Space Communication and Planetary Radar
A Phased Array of Widely Separated Antennas for Space Communication and Planetary Radar Dr. Barry Geldzahler NASA Headquarters, Washington DC Chris Bershad, Robert Brown, Rachel Cox, Richard Hoblitzell, John Kiriazes, Bruce Ledford, Michael Miller, Gary Woods NASA Kennedy Space Center, Cape Canaveral, Florida Timothy Cornish, Dr. Larry D’Addario, Dr. Faramaz Davarian, Dennis Lee, David Morabito, Philip Tsao Jet Propulsion Laboratory, Pasadena CA Jason Soloff NASA Johnson Space Flight Center, Houston TX Dr. Ken Church, Dr. Paul Deffenbaugh Sciperio, Inc., Orlando, FL. Keith Abernethy, William Anderson, John Collier, and Greg Wellen Southern Research Inc., Birmingham, AL. ABSTRACT NASA has successfully demonstrated coherent uplink arraying with real time compensation for atmospheric phase fluctuations at 7.145-7.190 GHz (X-band) and is pursuing a similar demonstration 30-31 GHz (Ka-band) using three 12m diameter COTS antennas separated by 60m at the Kennedy Space Center in Florida. In addition, we have done the same demonstration with up to three 34m antennas separated by ~250m at the Goldstone Deep Space Communication Complex in California at X-band 7.1 GHz. We have begun to infuse the capability at Goldstone into the Deep Space Network to provide a quasi-operational system. Such a demonstration can enable NASA to design and establish a high power (10 PW) high resolution (<10 cm), 24/7 availability radar system for (a) tracking and characterizing observations of Near Earth Objects (NEOs), (b) tracking, characterizing and determining the statistics of small-scale (≤10cm) orbital debris, (c) incorporating the capability into its space communication and navigation tracking stations for emergency spacecraft commanding in the Ka band era which NASA is entering, and (d) fielding capabilities of interest to other US government agencies.
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